The spelling of the word "heideman" can be explained through its IPA phonetic transcription, which is /ˈhaɪdəmən/. The first syllable "hei" is pronounced as "hi" with a long "i" sound, followed by the "d" sound in the second syllable. The third syllable "man" is pronounced with a short "a" sound followed by the "n" sound. The proper spelling maintains the correct order of letters to form the correct sounds and syllables.